JP2001069480A - Conditional access system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conditional access system where a repeater relays contents sent from a broadcast center without descrambling the contents with a simple configuration and the repeater can uniquely manage conditional access of a terminal. SOLUTION: A broadcast center 101 transmits a 1st EMM together with contents, a 1st ECM including a same scramble key Ks, and a 2nd ECM, and a CATV station 105 multiplexes a 2nd EMM on a transport stream including the contents to relay the resulting stream to a CATV channel 106. A CATV terminal 107 discriminates viewing on the basis of the 2nd ECM and the 2nd EMM, extracts the key Ks and views the contents, then the CATV station 107 relays the contents with a simple configuration without the need for descrambling the contents and manages conditional access of the CATV terminal 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a conditional access method or system for controlling reception of a terminal device for a signal obtained by relaying a signal such as a satellite broadcast via a transmission path such as a CATV.

[0002]

2. Description of the Related Art In satellite broadcasting and the like, a pass-through method is generally known as a method of transmitting a scrambled signal as it is without performing descrambling and re-scrambling in a CATV station or the like and performing limited reception. ing.

A method called simulcrypt is known as a method of mixing two or more limited receptions for one content.

[0004] A conventional technique will be described below with reference to the drawings.

FIG. 40 is a diagram showing a main part of a system configuration of a pass-through system.

A satellite center 4001 and a CATV station 4009 are connected to a satellite 40
The CATV station 4009 and the terminal device 4015 are connected via a CATV network.

[0007] A satellite center 4001 for transmitting content through a satellite has a content server 4002 for transmitting content including video and audio, information for scrambling the content, and information for decoding the content (EC).
M, EMM), a multiplexing unit 4003 for generating a stream multiplexing the content with ECM or EMM, a scrambler 4005 for scrambling the specified content of the stream, and a satellite for the stream. Transmission unit 4006 that performs transmission processing such as modulation according to the line
And a transmitting antenna 4007 for transmitting a modulated stream to a satellite line.

[0008] Further, the content received from the satellite is stored in a CA.
A CATV station 4009 for transmitting to a TV network includes a receiving antenna 4010 for receiving a stream from a satellite line, a receiving unit 4011 for performing reception processing such as demodulation on the received stream, and a cable for transmitting program sequence information (PSI) from a satellite transmission use. A PSI conversion unit 4012 for converting the data for transmission, and
It comprises a QAM modulator 4013 for modulating to a QAM system defined by TV, and a frequency conversion unit 4014 for converting a stream to a CATV transmission frequency and sending it to a CATV network.

[0009] In the satellite center 4001 of this system, the content server 4002 transmits content including video and audio to the multiplexing unit 4003. In addition, conditional access control section 4004,
A judgment area for judging permission to view the content and a scramble key (K
s) is encrypted with the work key (Kw) and transmitted to the multiplexing unit 4003.
Information (EMM) having a contract information area that gives permission to view content to the user and an ECM-encrypted Kw
Is encrypted with the individual key (Kmi) unique to each terminal device 4015, and transmitted to the multiplexing unit 4003. Further, the scrambler 4005 receives an identifier (PID) for identifying the content to be scrambled and a scramble key. (Ks).

[0010] The multiplexing device 4003 receives the received content and the E
The CM and the EMM are multiplexed into one stream and transmitted to the scrambler 4005. The scrambler 4005 selects the P specified by the conditional access control unit 4004 in the received stream.
The content having the ID is scrambled and transmitted to the transmission unit 4006. The transmission unit 4006 performs transmission processing such as modulation of the stream according to the satellite link,
Transmit to the satellite line via 07.

[0011] In the CATV station 4009, a receiving unit 4011 receives a stream from a satellite line via a receiving antenna 4010,
It performs reception processing such as demodulation and transmits it to the PSI conversion unit 4012. The PSI conversion unit 4012 converts NIT, which is a part of program sequence information (PSI), for transmitting information relating transmission line information such as a modulation frequency to content, from satellite transmission use to cable transmission use. QAM modulator
4040, the QAM modulator 4013 modulates the signal to the QAM method specified by CATV and transmits it to the frequency converter 4014, and the frequency converter 4014 converts the stream to the CATV transmission frequency and sends it out to the CATV network. .

The terminal device 4015 receives the stream from the CATV network, decodes the EMM addressed to itself,
When w is held and the scrambled content is viewed, first, the ECM attached to the content is received and decrypted with Kw, and the determination area in the ECM is compared with the contract information to determine whether or not the viewing is permitted. Find out. If it is determined that the viewing permission is present, the content can be descrambled using Ks in the ECM, and the content can be viewed.

As described above, in the pass-through method, the CATV station 4009 merely converts the stream into a modulation method suitable for the CATV network, and does not need to decode the ECM or EMM, and is not involved in the contents. Can be relayed without having to. In this method, each terminal device 4015
Is managed by the satellite center 4001.

FIG. 41 is a diagram showing a main part of a system configuration of a simulcrypt system in which a plurality of limited receptions are mixed for the same content. In FIG. 41,
The relationship between content, ECM, EMM, etc. is the same as described above.

The broadcast center 4101 generates a first EMM for the terminal device belonging to the first conditional access system.
A generating apparatus 4103 and a second EMM generating apparatus 4104 for generating an EMM for a terminal device belonging to the second conditional access system
And a first EC for generating an ECM of the first conditional access system
M generation device 4105, a second ECM generation device 4106 that generates an ECM of the second conditional access system, and a content server 4102 that sends out a content including video and audio.
A multiplexing unit 4109 for multiplexing the content with the first and second EMMs and the ECM; and a Ks generating device 4108 for generating Ks for scrambling the content at regular intervals.
And the first and second ECMs are output to the multiplexing unit 4109, and the PI
It includes a simulcrypt control unit 4107 that outputs D and Ks to the scrambler 4110, a scrambler 4110 that executes scrambling, and a transmission unit 4111 that modulates a stream and sends it to the terminal device 4112.

In the broadcasting center 4101 of this system, the content server 4102 transmits contents composed of video and audio to the multiplexing unit 4109. First EMM generator 41
03 transmits to the multiplexing unit 4109 a first EMM including a contract information area for giving permission to view contents to each terminal device 4112 belonging to the first conditional access system,
The generating device 4104 transmits, to the multiplexing unit 4109, a second EMM including a contract information area that gives the terminal device 4112 belonging to the second conditional access scheme permission to view the same content as described above. Also, the Ks generation device 4108 generates Ks for scrambling the content at regular intervals, and transmits the same to the simulcrypt control unit 4107. The simulcrypt control unit 4107 transmits the received Ks to the first ECM generation device 4105 and the second ECM generation device 4106, and the first ECM generation device 4105 determines whether to permit viewing of the content. The first ECM including the received Ks and the first ECM is transmitted to the simulcrypt control unit 4107, and the second ECM generating device 4106 determines the reception area and the reception area for the same content as described above. Generates a second ECM including the extracted Ks and a simulcrypt control unit.
Send to 4107.

Simulcrypt control unit 4107 transmits the received first ECM and second ECM to multiplexing unit 4109, and identifies P to identify the content to be scrambled.
The ID and Ks are transmitted to the scrambler 4110. Multiplexer 41
09, the content, the first ECM, the second ECM, the first EMM, and the second EMM are multiplexed and transmitted as one stream to the scrambler 4110.
Performs scrambling on the corresponding content based on the designated PID and Ks, and transmits the scrambled content to the transmitting unit 4111. The transmitting unit 4111 performs a modulation process or the like suitable for the transmission path on the stream and sends the stream to the transmission path.

Terminal device 4112 belonging to the first conditional access system
Receives the first EMM destined for itself from the stream, holds the contract information, compares the contract information with the determination area of the first ECM attached to the content, and if it is determined that the viewing permission is present, The content can be descrambled and can be viewed. Also, the terminal device 4112 belonging to the second conditional access system transmits the second EMM addressed to itself from the stream.
Receiving the contract information, holding the contract information, comparing the second ECM determination area attached to the content with the contract information, and if it is determined that the viewing permission exists, the content can be descrambled and can be viewed. Becomes

As described above, by using the simulcrypt method, it is possible to mix a plurality of conditional access for the same content.

Further, when the pass-through method and the simulcrypt method described above are combined, simple and flexible conditional access becomes possible. That is, assuming that the satellite center 4001 in FIG. 40 and the broadcasting center 4101 in FIG. 41 are the same, a plurality of conditional access can be mixed in the satellite center 4001, and the CATV station 4009 is involved in each ECM and EMM. Relay without doing. In this way, for example, when there is a direct receiving terminal that directly receives content from the satellite center 4001 through a satellite line, the direct receiving terminal uses the first conditional access system and connects to the CATV station 4009. The terminal device 4015 is connected to the satellite center 40 by using the second conditional access system.
01 and the CATV station 4009 can independently realize conditional access of each terminal.

[0021]

However, in the method combining the conventional techniques as described above, the second EMM generation device installed in the satellite center generates the EMM for the terminal device to be managed by the CATV station. And send it out. In this case, since it is necessary to notify the satellite center of the contract information of the terminal device managed by the CATV station or the EMM itself, the confidentiality of the contract information may be reduced.

Further, depending on the form of the system, it is assumed that there are a plurality of CATV stations that manage tens of thousands of terminal devices. In this case, the second E-mail transmitted from the satellite center is assumed.
The transmission capacity of the MM may increase significantly. In the current digital broadcasting, the transmission capacity of one broadcast frequency band is about 30 Mbps, and an increase in the transmission capacity of the second EMM means a decrease in the transmission capacity of the content. Or the number of channels may be reduced. Also, in this case, if the bandwidth of the transmission capacity of the second EMM is limited, the content is not affected, but the time required to transmit all of the second EMM because the bandwidth of the second EMM is limited. , The contract information of each terminal device is not immediately reflected, and there is a possibility that the customer cannot view the desired content immediately.

The present invention solves such a problem, and a relay device for relaying content from a center device does not descramble the content.
Further, the present invention provides a conditional access system capable of relaying an ECM or an EMM without decoding and effecting conditional access unique to the relay device without affecting content, and also provides an apparatus constituting the system. It is intended to be.

[0024]

According to a first aspect of the present invention, a center device, one or more relay devices, and one or more first terminal devices are connected by a first transmission line, and the relay device is connected to one or more relay devices. Is a conditional access system in which the second terminal device is connected via a second transmission line, wherein the center device scrambles the content including video and audio and sends the scrambled content to the first transmission line to scramble the content. A first work key and a first terminal device for encrypting and multiplexing the first common information including a scramble key to be accessed and an access determination area for determining access to the content with the content, and encrypting the first common information The first individual information including the contract information is encrypted and multiplexed with the content, and the second common information including the scramble key and the access determination area is encrypted with the second work key to generate the content. Weight, the relay device relays the information including the content received from the first transmission line to the second transmission line, and the second individual including the second work key and the contract information of the second terminal device. The information is encrypted and multiplexed with the information including the content and transmitted to the second transmission path, and the first terminal device determines the access determination area included in the first common information and the contract included in the first individual information. Means for controlling access to the content based on the information and the contract information included in the access determination area included in the second common information and the contract information included in the second individual information. have.

As described above, in the first invention, the center device transmits the content and the first individual information together with the scramble key obtained by scrambling the content in the first common information and the second common information, and relays the content. Since the device relays the received content, the first individual information, the first common information and the second common information without decoding, and multiplexes and transmits the second individual information, the relay device , The content from the center device can be provided with a simple configuration to the second terminal device connected to the second terminal device, the cost can be reduced, and the limited reception unique to the relay device can be performed.

According to a second aspect of the present invention, a center device, one or more relay devices, and one or more first terminal devices are connected via a first transmission line, and the relay device and one or more second terminal devices are connected. A conditional access system in which devices are connected via a second transmission path, and the center apparatus and the relay apparatus are further connected via a third transmission path, wherein the center apparatus transmits any one of video, audio, data, etc. The first common information including a scramble key for scrambling the content and a first access determination area for determining access to the content is encrypted and multiplexed with the content. A first work key for encrypting the first common information and the first individual information including the contract information of the first terminal device are encrypted and multiplexed with the content and transmitted to the first transmission path, S The second common information including the rumble key and the second access determination area for determining access to the content is encrypted with the second work key and transmitted to the third transmission path. Relaying the information including the content received from the third transmission path to the second transmission path, multiplexing the second common information received from the third transmission path with the information including the content, and setting the second work key and the second The second individual information including the contract information of the terminal device is encrypted and multiplexed with the information including the content and transmitted to the second transmission path, and the first terminal device transmits the second information included in the first common information. Based on the one access determination area and the contract information included in the first individual information, and the second terminal device, the second access determination area and the second individual information included in the second common information Access to content based on contract information contained in And a means of performing scan control.

As described above, in the second invention, the center device sends out the second common information to the third transmission line, and the relay device contains the second common information and the second individual information including the content. Since it is multiplexed with information, on the first transmission line,
Since the first terminal does not have unnecessary second common information,
This leads to prevention of malfunction of the first terminal device. Also, since the relay device can transmit the content and the second ECM to the second transmission path without particularly performing descrambling or decoding, the relay device can provide the content to the second terminal device with a simple configuration. The effect that cost reduction can be achieved is obtained.

In the third invention, the center device sends the second common information once every time it is changed, the relay device receives the second common information, and then changes the second common information. There is a means for repeatedly transmitting the second common information at regular intervals until the information is received.

As described above, in the third invention, the relay device repeatedly transmits the second common information.
It is possible to increase the transmission capacity of content and the like on the first transmission path, and to further improve the image quality of the content,
An effect such as multi-channeling is obtained.

According to a fourth aspect, the center device has means for encrypting the second common information using an encryption method different from the encryption method for the first common information.

As described above, in the fourth aspect of the present invention, the first common information and the second common information are encrypted by different methods, so that conditional access to the first terminal device and the second terminal device is limited. Can be further independently performed, so that even if one encryption method is broken, the other conditional access is not affected.

In a fifth aspect, the relay device has means for encrypting the second individual information with an encryption method different from the encryption method of the first individual information performed by the center device. .

As described above, in the fifth invention, since the encryption method of the first individual information and the second individual information are performed by different methods, the conditional access to the first terminal device and the second terminal device is limited. Can be further independently performed, so that even if one encryption method is broken, the other conditional access is not affected.

According to a sixth aspect of the present invention, there is provided a means for describing the access decision area of the first common information by a tier and describing the access decision area of the second common information by a channel bitmap.

As described above, in the sixth aspect of the present invention, the structures of the access determination areas for the first common information and the second common information are made different, so that the first terminal device and the second terminal device are limited. Reception can be performed more independently,
Even if the structure of one access determination area is found and tampered with, the effect is obtained that the other conditional access is not affected.

The seventh invention has means for describing the access determination area of the first common information by a channel bitmap and describing the access determination area of the second common information by a tier.

As described above, in the seventh aspect of the present invention, the structures of the access determination areas of the first common information and the second common information are made different, so that the first terminal device and the second terminal device are limited. Reception can be performed more independently,
Even if the forcing of one access determination area is detected and falsified, the effect is obtained that the other conditional access is not affected.

In an eighth aspect, the center device stores the scramble key in the second common information and sends it out, and the relay device transmits
It has means for receiving the second common information, adding an access determination area, and transmitting it.

As described above, in the eighth invention, the center device stores the scramble key in the second common information and sends it out.
Since the relay device adds the access determination area to the second common information and relays the same, it is possible to obtain the effect that conditional access to the second terminal device can be further independently performed.

According to a ninth aspect, the center device stores the scramble key in the second common information, encrypts the scramble key with the second work key, and transmits the encrypted second work information. The relay device receives the second common information, A determination area is added, and the area including the received second common information and the added access determination area is encrypted with the third work key and transmitted, and the second individual information has the second work key and the third work key. Means for storing and sending the work key. As described above, in the ninth invention, the center device stores the scramble key in the second common information and sends it out, the relay device adds an access determination area to the second common information, and furthermore, the third work key Therefore, the entire second common information including the access determination area is encrypted and transmitted, and the second individual information is transmitted including the third work key together with the second work key. In addition to the above, it is possible to perform the conditional access to the terminal device more independently, and to obtain the effect that the secrecy of the second common information can be secured.

According to a tenth aspect, the relay device has means for removing the first common information existing in the information including the content received from the first transmission path and relaying the same.

As described above, in the tenth aspect, since the relay device removes the first common information and relays the information, it is possible to increase the transmission capacity of information transmitted to the second transmission path. Can be

According to an eleventh aspect, the relay device replaces the first common information present in the information including the content received from the first transmission path with the second common information received from the third transmission path. It has the means to relay.

As described above, in the eleventh invention, the relay device replaces the second common information with the first common information and transmits the same, so that the transmission capacity of the information including the content on the first transmission path is changed. The effect of being able to relay to the second transmission path without increasing the number is obtained. In a twelfth aspect, the center device appropriately multiplexes empty information with the content and transmits the multiplexed information to the first transmission line, and the relay device transmits the information including the content received from the first transmission line to the first individual information. And relaying the same, and multiplexing by exchanging the empty information and the second individual information existing in the information including the content.

As described above, in the twelfth aspect, the relay device removes the first individual information and relays the same, and replaces the second information with empty information, and transmits the information. This has the effect of increasing the transmission capacity of the information to be sent to the server.

According to a thirteenth aspect, the relay device has means for multiplexing by exchanging the first individual information and the second individual information present in the information including the content received from the first transmission path. ing.

As described above, in the thirteenth aspect, when the relay device transmits the second individual information, the relay device replaces the first individual information and transmits the second individual information. The effect of being able to relay to the second transmission path without increasing the transmission capacity of the included information is obtained.

In the fourteenth aspect, the relay device has means for frequency-multiplexing and transmitting the second individual information in a frequency band different from the frequency band in which the information including the content is relayed.

As described above, in the fourteenth aspect, the relay device transmits the second individual information in a frequency band different from the frequency band in which the information including the content is relayed. There is an effect that the second individual information can be transmitted with an arbitrary transmission capacity without affecting the transmission capacity of the second individual information.

[0050] In the fifteenth aspect, the relay device and the second terminal device are also connected by a fourth transmission line different from the second transmission line, and the relay device transmits information including contents to the second transmission line. Relays the second individual information to the fourth transmission line, and the second terminal device receives the second common information received from the second transmission line and the second common information received from the fourth transmission line. And means for controlling access to the content based on the second individual information. As described above, in the fifteenth invention,
The relay device and the second terminal device are connected by the second transmission line and the fourth transmission line, the relay device relays information including the content to the second transmission line, and transmits the second individual information to the fourth transmission line. Since the transmission is performed via the transmission path, the effect that the second individual information can be transmitted with an arbitrary transmission capacity without affecting the transmission capacity of the information including the content is obtained.

In the sixteenth aspect, the second common information is provided with a program attribute indicating whether the content is a tier program or a pay-per-view program, and the center device stores the tier information and the pay-per-view information in the access determination area of the second common information. The relay device arbitrarily changes the program attribute of the second common information to a value indicating either the tier program or the pay-per-view program or both depending on the operation, and the second terminal device There is a means for referring to the attribute to determine access control in either the tier or the pay-per-view or both.

As described above, in the sixteenth aspect, the second common information is provided with a program attribute indicating whether the corresponding content is a tier program or a pay-per-view program, and the center apparatus sets the program attribute in the access determination area of the second common information. Since the tier information and the pay-per-view information are stored and transmitted, and the relay device arbitrarily changes the program attribute according to the operation and relays, the conditional access to the second terminal device can be further independently performed. The effect that it can be obtained is obtained.

In the seventeenth aspect, there is provided means for transmitting the second work key from the center device to the relay device via a storage medium.

As described above, in the seventeenth invention, the second work key is sent from the center device to the relay device via the storage medium, so that the effect that the second work key can be shared simply and reliably is obtained. Can be

The eighteenth invention has means for transmitting the second work key from the center device to the relay device via the first transmission line.

As described above, in the eighteenth aspect, the second work key is transmitted from the center device to the relay device via the first transmission line, so that the second work key is changed at an arbitrary timing. Yes, it can be shared immediately.

In the nineteenth aspect, there is provided means for transmitting the second work key from the center device to the relay device via the third transmission line.

As described above, in the nineteenth invention, the second work key is transmitted from the center device to the relay device via the third transmission line, so that the second work key is changed at an arbitrary timing. Yes, it can be shared immediately.

According to the twentieth aspect, there is provided means for transmitting the second work key from the center device to the relay device by using a public network.

As described above, in the twentieth aspect, the second work key is transmitted from the center device to the relay device using the public network, so that the second work key can be changed at any timing. The effect of being able to share immediately is obtained.

According to the twenty-first aspect, the second work key is transmitted from one relay device to the center device by a storage medium, and the center device has means for transmitting the received second work key to another relay device. are doing.

As described above, in the twenty-first aspect, the second work key is transmitted from one relay device to the center device by a storage medium, and the second work key is transmitted from the center device to another relay device. Therefore, the second work key can be easily and reliably shared, and the effect that the relay device can independently change the second work key can be obtained.

In the twenty-second aspect, the first transmission line is capable of two-way communication, and transmits the second work key from one relay device to the center device via the first transmission line. Has means for sending the received second work key to another relay device. As described above, in the twenty-second invention, the second work key is transmitted from one relay device to the center device via the first transmission line, and the center device sends the second work key to the other relay devices. With this configuration, the second work key can be changed at an arbitrary timing, can be shared immediately, and the relay device can independently change the second work key.

In the twenty-third aspect, the third transmission path is capable of two-way communication, and transmits the second work key from one relay apparatus to the center apparatus via the third transmission path. Has means for sending the received second work key to another relay device. As described above, in the twenty-third aspect, the second work key is transmitted from one relay device to the center device via the third transmission path, and the center device sends the second work key to the other relay devices. With this configuration, the second work key can be changed at an arbitrary timing, can be shared immediately, and the relay device can independently change the second work key.

In the twenty-fourth aspect, the second work key is transmitted from one relay device to the center device using the public network, and the center device sends the received second work key to another relay device. Means.

As described above, in the twenty-fourth aspect, the second work key is transmitted from one relay device to the center device using the public network, and the center device transmits the second work key to the other relay devices. Since the second work key is transmitted, the second work key can be changed at an arbitrary timing, can be shared immediately, and the effect that the relay device can independently change the second work key can be obtained.

In the twenty-fifth aspect, the center device or the relay device has means for encrypting the second work key using a secret key cryptosystem and transmitting the encrypted second work key.

As described above, in the twenty-fifth aspect, the center device or the relay device encrypts the second work key using the secret key and transmits the encrypted second work key. The effect that the information can be shared is obtained.

In the twenty-sixth aspect, the center device or the relay device has means for encrypting the second work key using a public key cryptosystem and transmitting the encrypted second work key.

As described above, in the twenty-sixth aspect, the center device or the relay device encrypts the second work key using the public key and transmits the encrypted second work key. The effect that the information can be shared is obtained.

In the twenty-seventh aspect, the center device stores the telephone number of the first viewing history collection destination in the second common information as necessary and sends it out, and the relay device transmits the second viewing information as necessary. Storing and sending out the telephone number of the second viewing history collection destination in the individual information, and the terminal device transmits the viewing history by preferentially using the telephone number of the first viewing history collection destination. Have.

As described above, in the twenty-seventh aspect, the center device stores the telephone number of the first viewing history collection destination in the second common information as necessary and sends it out. Then, the second viewing information collection destination telephone number is stored and transmitted in the second individual information, and the terminal device transmits the viewing history by preferentially using the first viewing history collection destination telephone number. Therefore, the effect is obtained that the viewing history can be collected at any viewing history collection destination.

In the twenty-eighth aspect, the common information removing device is provided in the relay device and has means for removing the first common information from the information including the content.

As described above, in the twenty-eighth aspect, the common information removing device removes the first common information from the information including the content, so that the common terminal is unnecessary for the second terminal device on the second transmission line. Since there is no such first common information, an effect of preventing malfunction of the second terminal device can be obtained.

In the twenty-ninth aspect, the common information multiplexing device is installed in the relay device, and the first common information of the information including the content received from the first transmission path and the second common information received from the third transmission path. Means for replacing the common information.

As described above, in the twenty-ninth aspect, the common information multiplexing device includes the first common information of the information including the content received from the first transmission path and the second common information received from the third transmission path. Since the common information is replaced, the effect of being able to relay to the second transmission path without increasing the transmission capacity of information including the content on the first transmission path is obtained.

In the thirtieth invention, the individual information removing device is provided in the relay device, and has means for removing the first individual information from the information including the content.

As described above, in the thirtieth aspect, the individual information removing device removes the first individual information from the information including the content, so that the transmission capacity of the information transmitted to the second transmission path is increased. Since the unnecessary first individual information is eliminated in the second terminal device, an effect of preventing malfunction of the second terminal device can be obtained.

[0079] In the thirty-first aspect, the individual information multiplexing device is provided in the relay device, and has means for exchanging the first individual information and the second individual information in the information including the content.

As described above, in the thirty-first aspect, the individual information multiplexing apparatus exchanges the first individual information and the second individual information in the information including the content and transmits the information. The effect of being able to relay to the second transmission path without increasing the transmission capacity of the information including the content on the road is obtained.

In the thirty-second aspect, the common information multiplexing device is provided in the relay device and has means for repeatedly transmitting the received second common information until the next changed second common information is received. Have.

As described above, in the thirty-second aspect, the common information multiplexing device repeatedly transmits the received second common information until the next changed second common information is received. In addition, it is possible to increase the transmission capacity of the content and the like on the first transmission path, and it is possible to obtain the effect of further improving the image quality of the content and increasing the number of channels.

[0083]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof.

(First Embodiment) In the first embodiment, satellite broadcasting, which is an example of a conditional access system, is a CAT.
A digital broadcasting system for relaying and broadcasting at the V station will be described.

FIG. 1 is a block diagram showing the entire configuration of the conditional access system according to this embodiment.

The broadcasting center 101 and the CATV station 105 are artificial satellites.
It is connected by a satellite line 102 using 103, and a broadcasting center 101 and a direct receiving terminal 104 are also connected by a satellite line 102.
Further, the CATV station 105 and the CATV terminal 107 are connected to the CATV line 10.
Connected at 6.

The broadcast center sends out a broadcast wave to the satellite line 102, and the direct receiving terminal 104 receives the wave directly from the satellite line 102. The CATV station 105 relays the broadcast wave received from the satellite line 102 to the CATV line 106, and the CATV terminal 107
Broadcast radio waves are received from the ATV line 106.

FIG. 2 is an example of a block diagram showing a main part of the internal configuration of the broadcast center 101.

The broadcast center 101 includes a content server 201 for transmitting contents including video and audio, a first Kw management unit 203 for holding a first Kw (work key),
The second Kw management unit 206 that holds the second Kw, and the contract information of the first Kw and the direct receiving terminal 104 are stored in the first EMM
(Individual information) and directly store the Kmi unique to the receiving terminal device.
A first EMM generator 202 for encrypting with an (individual key) and a Ks generator for generating Ks (scramble key) at regular intervals
208, a first ECM generation unit 204 that stores the Ks and the viewing determination information of the content to be subjected to conditional access in the first ECM, and encrypts the content using the first Kw; The viewing determination information of the content to be
The second E stored in the CM and encrypted using the second Kw
The CM generation unit 205 transmits Ks to the first ECM generation unit 204 and the second ECM generation unit 205, and transmits Ks and the packet identifier (PID) of the content to be scrambled to the scrambler 210. A simulcrypt control unit 207 for transmitting the first ECM and the second ECM input from the one ECM generating unit 204 and the second ECM generating unit 205 to the multiplexing unit 209; a content, a first EMM, a first EMM; EC
A multiplexing unit 209 that multiplexes the M and the second ECM to output a transport stream, a scrambler 210 that scrambles a packet of content in the transport stream using Ks, and a modulation and the like according to the satellite channel 102. A transmission unit 211 that performs processing and a transmission antenna 212 that transmits a transport stream to the satellite channel 102 as broadcast radio waves are provided.

The content server 201 transmits content including video and audio to the multiplexing unit 209 in the MPEG-2 transport stream format. The first Kw management unit 203 holds the first Kw, transmits the first Kw to the first EMM generation unit 202 and the first ECM generation unit 204, and the first EMM generation unit 202 The first Kw and the contract information of the direct receiving terminal 104 are stored in the first EMM, and the Kmi (individual key) unique to the direct receiving terminal device is used to store the first EMM.
Is encrypted and transmitted to the multiplexing unit 209. The second Kw management unit 206 holds the second Kw, transmits the second Kw to the second ECM generation unit 205, and
08 generates Ks at fixed intervals, and Simulcrypt control unit
Send to 207. The simulcrypt control unit 207 transmits Ks to each of the first ECM generation unit 204 and the second ECM generation unit 205, and the first ECM generation unit 204 determines whether to view Ks and the content targeted for conditional access. The information is stored in the first ECM, the area to be encrypted of the first ECM is encrypted using the first Kw, and the
Send to 207. The second ECM generation unit 205 stores the Ks and the viewing determination information of the content to be subjected to conditional access in the second ECM, and encrypts the area to be encrypted of the second ECM using the second Kw. Simulcrypt control unit
Send to 207. Simulcrypt control unit 207 transmits Ks and the packet identifier (PID) of the content to be scrambled to scrambler 210, and sets the first EC
M and the second ECM are transmitted to the multiplexing unit 209. Multiplexer 209
Is the received content, first EMM, first ECM
And the second ECM is multiplexed and transmitted to the scrambler 210 as one transport stream. The scrambler 210 receives the PI received from the simulcrypt control unit 207.
Based on D, scramble the packet of the corresponding content in the transport stream using Ks,
Transmit to transmitting section 211. The transmission unit 211 performs processing such as modulation according to the satellite link 102, and via the transmission antenna 212,
The transport stream is transmitted to the satellite line 102 as broadcast radio waves.

FIG. 3 is an example of a block diagram showing a main part of the internal configuration of the CATV station 105.

The CATV station 105 includes a receiving antenna 301 for receiving a broadcast wave from the satellite line 102, a receiving section 302 for performing processing such as demodulation of a received signal, and a PSI conversion for converting NIT from satellite transmission use to cable transmission use. Unit 303, a second Kw management unit 307 holding the same second Kw as the second Kw management unit 206 of the broadcast center 101, and a second Kw and contract information of the CATV terminal 107 in the second Kw. Stored in the EMM of
A second EMM generating unit 308 for encrypting with the Kmi unique to the CATV terminal 107, and a multiplexing unit 304 for multiplexing the second EMM with the transport stream input from the PSI conversion unit 303 to form one transport stream. A QAM modulator 305 that modulates the transport stream according to the CATV line 106, a frequency converter 306 that converts the transport stream into a frequency band to be transmitted, and a mixing unit that sends the transport stream to the CATV line 106. 309.

The receiving section 302 receives a signal from the satellite line 102 through a receiving antenna.
Broadcast radio waves are received via 301, processing such as demodulation is performed, and a transport stream to be relayed is transmitted to the PSI conversion unit 303. PSI conversion section 303 is a part of program sequence information (PSI) and transmits N information for associating transmission path information such as a modulation frequency with content.
IT (Network_Information_Ta)
ble) is converted from satellite transmission use to cable transmission use and transmitted to the multiplexing unit 304. The second Kw management unit 307 holds the same second Kw as the second Kw management unit 206 in the broadcast center 101, and transmits the second Kw to the second EMM generation unit 308. The second EMM generation unit 308 calculates the second K
w and the contract information of the CATV terminal 107 are stored in the second EMM, and the KMI unique to the CATV terminal 107 is used to store the second EM.
The M area to be encrypted is encrypted and transmitted to the multiplexing unit 304. The multiplexing unit 304 further multiplexes the transport stream with the second EMM to form one transport stream and transmits the transport stream to the QAM modulator 305. The QAM modulator 305 modulates the transport stream according to the CATV line 106. The signal is transmitted to the frequency conversion unit 306, the frequency conversion unit 306 converts the transport stream into a frequency band to be transmitted, and transmits it to the mixing unit 309. The mixing unit 309 mixes necessary information (in this case, The transport stream having no information to be mixed is transmitted to the CATV line 106.

FIG. 4 is an example of a block diagram showing a main part of the internal configuration of the direct receiving terminal 104.

The direct receiving terminal 104 includes a tuner 402 for receiving a broadcast wave selected from the satellite line 102 via a receiving antenna 401, a demodulation unit 403 for performing demodulation processing on the received transport stream, and a A separating unit 404 for separating one EMM and the first ECM from the other, decrypting the first EMM to extract the contract information and the first Kw, and decrypting the first ECM with the first Kw Conditional access module for extracting viewing judgment information and Ks
405, a descrambler 406 for descrambling the packet of the content in the transport stream using the extracted Ks, and an output control unit 407 for converting the content into a signal corresponding to the output mode.

The tuner 402 of the direct receiving terminal 104 receives a broadcast wave from the satellite line 102 via the receiving antenna 401 and demodulates the transport stream to be received by the demodulator 403.
Send to The demodulation unit 403 performs demodulation processing corresponding to the transmission unit 211 in the broadcast center 101 on the transport stream, and transmits the transport stream to the separation unit 404. The separation unit 404 separates the first EMM and the first ECM from the transport stream. Then, it transmits to conditional access module 405, and transmits the remaining transport stream to descrambler 406.
The conditional access module 405 decrypts the first EMM using the Kmi that is stored in advance, and obtains the contract information and the first Kw
Is extracted and held, and when the first ECM is received, the first K
Decoding is performed using w, the viewing determination information and Ks are extracted, and the contract information and the viewing determination information are compared. If it is determined that viewing is possible, Ks is transmitted to the descrambler 406. The descrambler 406 descrambles the packet of the content in the transport stream using Ks and transmits the descrambled packet to the output control unit 407, and the output control unit 407 converts the content into a signal corresponding to the output mode. For example, when outputting to a television, conversion to a television signal is performed and transmitted.

FIG. 5 is an example of a block diagram showing a main part of the internal configuration of CATV terminal 107.

The CATV terminal 107 includes a tuner 502 for receiving a broadcast signal from the CATV line 106, a demodulation unit 503 for performing a demodulation process on the received transport stream, and a second EMM and a second EC from the transport stream.
A separating unit 504 for separating M from the others, decoding the second EMM to extract the contract information and the second Kw, and
A conditional access module 505 that decodes M with the second Kw to extract the viewing determination information and Ks, a descrambler 506 that descrambles the packet of the content in the transport stream using the extracted Ks, An output control unit 507 that converts the signal into a signal corresponding to the output form.

The tuner 502 of the CATV terminal 107
A broadcast signal is received from the ATV line 106, and a transport stream to be received is transmitted to the demodulation unit 503. Demodulator 5
03 performs a demodulation process corresponding to the QAM modulation unit 305 in the CATV station 105 on the transport stream and transmits it to the separation unit 504. The separation unit 504 separates the second EMM and the second ECM from the transport stream. And transmits the remaining transport stream to the descrambler 506. The conditional access module 506 decrypts the second EMM using Kmi that is stored in advance, extracts and stores the contract information and the second Kw,
When the second ECM is received, decoding is performed using the second Kw, the viewing determination information and the Ks are extracted, and the contract information and the viewing determination information are compared. Send to rambler 506. Descrambler 506 is K
s, descrambles the packet of the content in the transport stream and transmits the descrambled packet to the output control unit 507. The output control unit 507 converts the content into a signal corresponding to the output mode, for example, outputs the signal to a television. If so, conversion to a television signal is performed and transmitted.

The operation of the conditional access system having the above configuration will be described below.

In the broadcast center 101, the content server 201 sends one or more contents. The contents are in the MPEG2 transport stream format, and all audio and video included in the contents are transmitted in the packet format. Further, one or more contents are included in one transport stream, and each content is expressed as a channel. It is assumed that the content server 201 also sends out the PSI (program arrangement information) for indicating the configuration of the channel, that is, the configuration of the packet included in each content.

The first Kw management section 203 transmits the first Kw and the paired KwID to the first EMM generation section 202 and the first ECM generation section 204.

The first EMM generation unit 202 is connected to each direct receiving terminal 1
Send the first EMM to 04. As shown in FIG. 6, the basic configuration of the EMM is terminal ID 601, Kw ID 602, Kw
It includes a storage area 603 and a contract information area 604. This basic configuration is common to the first EMM and the second EMM (generated by the CATV station). To explain the first EMM, the terminal ID 601 is assigned to each of the direct receiving terminals 1 that are destinations of the EMM.
04 stores a unique terminal ID (identification number),
When changing the first Kw, two or more first Kw
When w is required, a KwID (work key identification) for identifying each first Kw is stored, and the first Kw itself paired with the KwID stored in the KwID 602 is stored in the Kw storage area 603. In the contract information area 604, the direct receiving terminal 1 corresponding to the terminal ID stored in the terminal ID 601 is stored.
Stores contract information for 04. Further, the KwID 602, the Kw storage area 603, and the contract information area 604 are encrypted with a Kmi (individual key) unique to the direct receiving terminal 104 corresponding to the terminal ID.
The first EMM generation unit 202 generates and sends out such a first EMM.

Simulcrypt control unit 207 transmits Ks received from Ks generation unit 208 to first ECM generation unit 204 and second ECM generation unit 205.

The first ECM generating section 204 generates and sends out a first ECM attached to the content. The basic configuration of the ECM is, as shown in FIG.
02, including the viewing determination area 703. This basic configuration is the first E
To explain the first ECM, which is common to the CM and the second ECM, KwID 701 is the identifier of the first Kw that encrypts the first ECM, and the Kw ID 701 in the first EMM
This corresponds to ID 602. The Ks storage area 702 stores Ks for scrambling the content, and the viewing determination area 703 stores information for determining viewing of the content. Also,
The Ks storage area 702 and the viewing determination area 703 are encrypted using the first Kw paired with the KwID stored in the KwID 701. The first ECM generation unit 204 performs such a first ECM
A CM is generated and transmitted to the simulcrypt control unit 207.

The second Kw management unit 206 transmits the second Kw and the paired KwID to the second ECM generation unit 205.

The second ECM generation unit 205 generates and sends out a second ECM attached to the content. EC of FIG.
Describing the second ECM based on the M basic configuration, KwID 701 is the identifier of the second Kw, corresponds to KwID 602 in the second EMM, and is the same as the KwID stored in the first ECM. No need. Ks storage area 70
2 stores Ks for scrambling the content. In this case, the same Ks as the Ks stored in the first ECM is stored. The viewing determination area 703 stores information for performing viewing determination of the content. In this case, the viewing determination area does not need to be the same as the viewing determination information stored in the first ECM. Also, Ks
The storage area 702 and the viewing determination area 703 are encrypted using the second Kw paired with the KwID stored in the KwID 701. The second ECM generation unit 205 performs such a second ECM
Is generated and transmitted to the simulcrypt control unit 207.

Simulcrypt control unit 207 identifies the packet of the content to be scrambled (PI
D) and Ks are transmitted to the scrambler 210, and the first EC
M and the second ECM are transmitted to the multiplexing unit 209.

The multiplexing unit 209 includes a content, a first EMM,
The first ECM and the second ECM are multiplexed and transmitted as one transport stream, and the scrambler 210 converts the packet of the content to be scrambled in the transport stream based on the designated PID. After scrambling and transmitting, the transmitting section 211 and the transmitting antenna 212
And transmits it to the satellite line 102 as a broadcast wave via

At CATV station 105, PSI conversion section 303
Rewrites the NIT in the received transport stream. Specifically, the received NIT describes the physical information of the transmission path such as the frequency band and the modulation method on the satellite line. At the same time, it is possible to receive an appropriate transport stream from broadcast waves. If the NIT is directly relayed to the CATV line 106, the CATV terminal 107 cannot receive the transport stream. Therefore, the NIT is changed from the content suitable for the satellite line 102 to the content suitable for the CATV line 106.

The second Kw management unit 307 in the CATV station 105
Manages the same second Kw as the second Kw management unit 206 in the broadcast center 101, and transmits the KwID and the second Kw to the second EMM generation unit 308.

The second EMM generating section 308 sends the second EMM to each CATV terminal 107. Second EMM
6, the terminal ID 601 stores a unique terminal ID of each CATV terminal 107 that is a destination of the second EMM, and the Kw ID 602 includes two or more terminals when changing the second Kw. When a second Kw is required, a KwID for identifying each second Kw is stored,
The Kw storage area 603 stores the second Kw itself that is paired with the KwID stored in the KwID 602, and stores the contract information area.
604 indicates a CA corresponding to the terminal ID stored in the terminal ID 601.
The contract information of the TV terminal 107 is stored. Also, KwID60
2. The Kw storage area 603 and the contract information area 604 are encrypted with the Kmi unique to the CATV terminal 107 corresponding to the terminal ID.
The second EMM generation unit 308 generates such a second EMM and sends it to the multiplexing unit 304.

The multiplexing unit 304 further multiplexes the second EMM into the transport stream and sends out the transport stream as one transport stream. The multiplexing unit 304 passes through the QAM modulation unit 305, the frequency conversion unit 306, and the mixing unit 309 to the CATV line 106. To a broadcast signal.

At the direct receiving terminal 104, the receiving antenna 4
01, receives the transport stream including the content to be viewed from the satellite line 102 via the tuner 402 and the demodulation unit 403, and the separation unit 404 separates the first ECM and the first EMM addressed to itself from the transport stream. To the conditional access module 405.

The conditional access module 405 is the first EMM
The Ks is transmitted to the descrambler 405 when it is determined that viewing is possible by comparing the contract information of the first ECM with the viewing determination information of the first ECM.

The flowchart shown in FIG. 8 shows the basic viewing / listening determination processing, and includes the conditional access module 405 and (CAT
Basic processing of the conditional access module 505 (of the V terminal)
First, the conditional access module 405 will be described.

When the first EMM has contracted, the first EMM has received it in advance, decrypts it using Kmi, and holds the KwID, the first Kw, and the contract information.

Step 801: The first ECM is received, and based on the KwID of the non-encrypted part, decryption of the encrypted part is performed using the corresponding first Kw.

Step 802: If it is determined that viewing is possible by comparing the decrypted viewing determination information with the contract information stored in advance, Step 803: Ks is transmitted to the descrambler 406.

If it is determined in step 802 that viewing is impossible, step 804: error processing is performed, for example, a reply indicating that no contract is made.

Assuming that the determination method in step 802 is tier determination, a tier bit indicating the contract information is described in the contract information area of the first EMM, and the content viewing determination is performed in the viewing determination area of the first ECM. Is described. When the viewing determination area is described by tier bits, the configuration is as shown in FIG. 9, and when the contract information area is described by tier bits, the configuration is as shown in FIG. For example, the viewing determination tier bit 901 of the first ECM attached to all contents belonging to professional baseball and Hanshin has a corresponding bit of 1 as shown in FIG. First EMM contract information Tierbit 1001 when contracted for war
Has a corresponding bit of 1 as shown in FIG. Then, the first terminal device 104 having the contract information tier bit 1001 is
When trying to view the content corresponding to the CM, a bit comparison between the viewing determination tier bit 901 and the contract information tier bit 1001 is performed, and even if only one item is set, each bit is 1 bit.
If there is an item of, it can be viewed. In other words, in this example, the items of the Battle of Hanshin are 1 each other, so that they can be viewed. Conversely, when the first terminal device 104 having the contract information 1001 attempts to view the content belonging to the professional baseball game and the giant game, the viewing judgment tier bit of the content includes only one item for the professional baseball game and the giant game. Therefore, even if the bit comparison is performed, there is no item that becomes 1 and thus the viewer cannot view. Also, since the item of professional baseball is 1 in the contract information tierbit when contracting for professional baseball, the content belonging to the professional baseball and Hanshin game and the content belonging to the professional baseball and giant game are both viewable. Become. As described above, when represented by tier bits, one item of tier bits may include a plurality of contents, and one content may belong to a plurality of items.

[0122] The CATV terminal 107 receives the transport stream containing the content to be viewed from the CATV line 106 via the tuner 502 and the demodulation unit 503, and the separation unit 504 converts the transport stream from the transport stream into the second ECM.
And the second EMM for itself is separated and transmitted to the conditional access module 505.

The conditional access module 505 is provided with the second EMM
The Ks is transmitted to the descrambler 506 when it is determined that viewing is possible by comparing the contract information of the first ECM with the viewing determination information of the first ECM. More specifically, the determination process is the same as the above-described flowchart of FIG. 8, in which the second EMM has been received in advance, decrypted using Kmi, and has the KwID, the second Kw
And contract information. In step 801, the second ECM is received, and the encryption unit is decrypted using the corresponding second Kw based on the KwID of the non-encryption unit. Step 80
In step 2, if it is determined that viewing is possible by comparing the decrypted viewing determination information with the contract information held in advance, step 803.
Then, Ks is transmitted to the descrambler 506, and if it is determined that viewing is impossible, the process proceeds to step 804, where error processing is performed.
For example, a reply is sent to the effect that the contract has not been made. Assuming that the determination method in step 802 is a channel bitmap, a bitmap indicating the contract information is described in the contract information area of the second EMM, and the viewing determination area of the second ECM indicates the viewing determination of the content. Describe the bitmap. When the viewing determination area is described in a bitmap, the configuration is as shown in FIG. 11, and when the contract information area is described in a bitmap, the configuration is as shown in FIG. For example, in the viewing determination bitmap 1101 of the content of channel 3 (CH3), only the corresponding item is 1, as shown in FIG.
3. Contract information bitmap 1201 when contracting CHN
Indicates that the corresponding item is 1 as shown in FIG. Then, the CATV terminal 107 having the contract information bitmap 1201
When the user wants to view the content corresponding to the second ECM having the viewing determination bitmap 1101, bit comparison is performed, and if only one item is present, the item can be viewed. That is, in this example, since the items of CH3 are 1 each other, they can be viewed. Conversely, if the CATV terminal 107 having the contract information bitmap 1201 attempts to view CH1, the viewing determination bitmap for the content of CH1 is only 1 for CH1, so that even if the bit comparison is performed, each other is 1 There is no item that can be watched. When represented by a bitmap, one item of the bitmap corresponds to one channel.

As described above, according to the present embodiment, the broadcast center 101 sends out the first ECM, the second ECM, and the first EMM together with the content, and the CATV station 105 multiplexes the second EMM. The direct receiving terminal 104 makes a viewing judgment on the content using the first ECM and the first EMM, and the CATV terminal 107 makes a viewing judgment on the content using the second ECM and the second EMM. The broadcast center 101 is directly connected to the receiving terminal 104
CATV station 105 independently manages CAT
The effect that the conditional access of the V terminal can be managed can be obtained. Further, when relaying the information including the content, the CATV station 105 does not need to descramble the content and decode the first ECM, the second ECM, and the first EMM. It is possible to reduce the cost of the equipment. In addition, the direct receiving terminal 10
Since the viewing determination of 4 can be a tier bit and the viewing determination of the CATV terminal 107 can be a bitmap, the CATV station 105 can operate more independently.

In the present embodiment, the first EC
If the encryption methods performed by the M generation unit 204 and the second ECM generation unit 205 are different, even if one of the encryption methods is broken, the other can be operated without any influence.
The TV station 105 can operate the conditional access more independently.

Further, the first EMM generation unit 202 and the second EMM
If the encryption schemes performed by the MM generation unit 308 are different, even if one of the encryption schemes is broken, the other can operate without any influence. Operation becomes possible.

The basic configuration diagram of the EMM shown in FIG. 6 is merely basic, and the first EMM and the second EMM are not shown.
The MMs need not be in the same format, but can be implemented in different formats, in which case,
The CATV station 105 can operate the conditional access more independently.

Similarly, the basic configuration diagram of the ECM shown in FIG. 7 is basically the same, and the first ECM and the second ECM do not need to have the same format, but can be realized in different formats. It is possible, and in this case, the CATV station 105 can operate the conditional access more independently.

Also, in the present embodiment, the direct receiving terminal 10
Although the viewing determination of 4 is a tier bit and the viewing determination of the CATV terminal 107 is a bitmap, each viewing determination may be performed in the opposite manner, or may be performed by either one of the methods. It is also possible to combine with a map, and various operations become possible. The conditional access modules 405 and 505 may be built-in chips or the like, or may be a removable IC card or PCMCI.
An A card or the like may be used.

As a method of sharing the same second Kw between the second Kw management section 206 in the broadcast center 101 and the second Kw management section 307 in the CATV station 105,
The management unit 206 writes the second Kw to a storage medium such as a floppy disk or an IC card, sends the second Kw to the CATV station 105, and the second Kw management unit 307 reads the storage medium from the storage medium, so that the second Kw can be shared. Becomes Conversely, CATV station 10
The second Kw management unit 307 may write the second Kw to the storage medium and send it to the broadcasting center 101, and the second Kw management unit 206 may read the storage medium. Also, in this case, when a plurality of CATV stations 105 are connected to the broadcasting center 101, a storage medium is sent from one CATV station 105 to the broadcasting center 101, and the broadcasting center 101
There is also a method of sending to the TV station 105. Also, one CAT
From V station 105 to broadcast center 101 and other CATV stations 105
To send a storage medium.

As another method of sharing the second Kw, the broadcast center 101 uses the second Kw management unit 206
Is transmitted to the satellite circuit 102 via the transmitting unit 211 and the transmitting antenna 212, and the second Kw managing unit 307 of the CATV station 105 transmits the second Kw to the receiving unit 30.
There is also a method of receiving the second Kw via the receiving antenna 301 and the receiving unit 302 as the connection to the second Kw. Further, the transmitting antenna 212, the receiving antenna 301 and the satellite circuit 10
Assuming that the second Kw is capable of two-way communication, the second Kw management unit 307 of the CATV station 105 transmits the second Kw to the satellite line 102, and the second Kw management unit 206 of the broadcast center 101 transmits the second Kw management unit 206 to the satellite line. Ten
There is also a method of receiving the second Kw via 2. Also, in this case, when a plurality of CATV stations 105 are connected to the broadcasting center 101, the second Kw is transmitted from a certain CATV station 105 to the broadcasting center 101 via the satellite line 102, Center 101 has satellite link to other CATV stations 105
There is also a method of transmitting via 102. Also, one C
ATV station 105 to broadcast center 101 and other CATV stations
There is also a method of transmitting to the 105 via the satellite line 102. When using this satellite line 102, the second Kw is set to CATV
It may be stored in an EMM addressed to the station 105 and transmitted.

Further, as another method of sharing the second Kw, the second Kw management unit 206 of the broadcast center 101 and the CA
Assuming that the second Kw management unit 307 of the TV station 105 is connected to the public network, there is a method of sharing via the public network. In this method, similarly to the above two methods, a method of transmitting from the broadcast center 101 to the CATV station 105 and a method of transmitting a certain CATV
A method of transmitting from the station 105 to the broadcasting center 101, and a method of transmitting from the broadcasting center 101 to the other CATV stations 105;
ATV station 105 to broadcast center 101 and other CATV stations
There is a method to send to 105.

Further, the second Kw is stored in the storage medium or the satellite line 10.
2 and when transmitting using a public network, confidentiality can be improved by encrypting the second Kw using a secret key cryptosystem or a public key cryptosystem.

(Second Embodiment) FIG. 13 shows a CATV station.
3 is an example showing a configuration of a main part of a multiplexing unit 304 in 105.

The multiplexing unit 304 includes a common information removing device 1301 and a multiplexing device 1302.
Upon receiving the transport stream from the conversion unit 303 and removing the first ECM, the multiplexing device 1302
A second EM is added to the transport stream from which the M has been removed.
M is multiplexed and transmitted to QAM modulation section 305. Broadcasting center 1
01 and the other configurations of the CATV station 105 and the configurations of the direct receiving terminal 104 and the CATV terminal 107 are the same as those in the first embodiment, and thus the operation will be described below.

As a method for the common information removing device 1301 to remove the first ECM from the transport stream, since the first ECM and the second ECM are all in the packet format of the MPEG-2 transport stream, FIG.
A PID (packet identifier), which is a number for identifying the type of a packet, as shown in FIG.
Has been granted. Therefore, the first ECM and the second EC
If the PID of M is set to a different value, it can be easily removed.

As another removing method, the first EC
When the M and the PID of the second ECM have the same value, the ECM identifier 1501 is provided in the non-encrypted part of the ECM as shown in FIG. 15, and the value of the ECM identifier 1501 is changed to the first ECM and the second ECM.
If the values of M and M are set to different values, it is possible to easily remove the ECM without decoding it.

As described above, according to the present embodiment, the common information removing device 1301 removes the first ECM, so that unnecessary information does not flow to the CATV terminal 107. This leads to prevention of malfunction of the CATV terminal 107, and further has an effect of increasing the transmission capacity of the CATV line 106 other than the first ECM.

[0139] It should be noted that although the video and audio and the like contain time information for reproduction, the common information removing device 1301
When the first ECM is removed, the difference may be reflected in the time information and recalculated, or the recalculation may be performed as needed. In this way, the removal can be performed without affecting the reproduction of the content. .

The common information elimination device 1301 is the first EC
Instead of removing M, it may be replaced with empty information (null packet), and this leads to prevention of malfunction of the CATV terminal 107.

(Third Embodiment) FIG. 16 shows a CATV station.
3 is an example showing a configuration of a main part of a multiplexing unit 304 in 105.

The multiplexing unit 304 includes an individual information removing device 1601 and a multiplexing device 1602. The individual information removing device 1601
The transport stream is received from the converter 303, the first EMM is removed, and the transport stream is transmitted to the multiplexer 1602. The multiplexer 1602 multiplexes the transport stream with the second EMM and transmits the transport stream to the QAM modulator 305. I do. The other configuration is the same as that of the first embodiment, and the operation will be described below by diverting.

As a method of the individual information removing device 1601 removing the first EMM from the transport stream, since the first EMM and the second EMM are in the packet format of the MPEG-2 transport stream, their PIDs are separated. If it is set to a value, it can be easily removed.

As another removing method, the first EM
When the M and the PID of the second EMM have the same value, an EMM identifier 1701 is provided in the non-encrypted part of the EMM as shown in FIG. 17, and the value of the EMM identifier 1701 is changed to the first EMM and the second EMM.
If different values are used for M and E, the EMM can be easily removed without decoding.

FIG. 18 is a diagram for explaining the operation of the multiplexer 1602. The multiplexing device 1602 has a buffer of one or more packets, checks the type of packet while storing the transport stream in the buffer, and sequentially transmits the packet. Further, the buffer holding the second EMM received from the second EMM generation unit 308 also has one or more packets. Then, when a null packet (empty information) is detected in the transport stream when the second EMM is held, the held second EMM and the null packet are exchanged and transmitted.

As described above, according to the present embodiment, since the individual information removing device 1601 removes the first EMM, unnecessary information does not flow to the CATV terminal 107. This leads to prevention of malfunction of the CATV terminal 107, and has the effect of increasing the transmission capacity of the CATV line 106 other than the first EMM.

Further, since the multiplexer 1602 replaces the second EMM with a null packet and transmits the packet, the multiplexer 1602 can multiplex the second EMM without changing the transmission rate of the transport stream. It becomes possible.

[0148] It should be noted that although video and audio and the like contain time information for reproduction, the individual information removing device 1601
When the first EMM is removed, the difference may be reflected in the time information and recalculated, or the recalculation may be performed as necessary. In this way, the content can be removed without affecting the reproduction of the content. .

[0149] Also, the time required for the multiplexing device 1602 to hold the transport stream may be reflected in time information for reproduction and recalculated. Never.

The individual information removing device 1601 is provided with the first E
Instead of removing the MM, it may be replaced with a null packet, which leads to prevention of malfunction of the CATV terminal 107.

Further, the multiplexing apparatus 1602 replaces the second EMM with a null packet and transmits the packet. However, it is also possible to replace not only the null packet but also the first ECM and transmit the packet. For example, without changing the transmission rate of the transport stream, the second EM
The effect that the transmission capacity of M can be increased is obtained.

(Fourth Embodiment) FIG. 19 shows a CATV station.
3 is an example showing a configuration of a main part of a multiplexing unit 304 in 105.

The multiplexing section 304 includes an individual information multiplexing apparatus 1901. The individual information multiplexing apparatus 1901 receives the transport stream from the PSI conversion section 303 and receives the second EMM from the second EMM generating section 308. , The first EMM and the second EMM in the transport stream are exchanged and transmitted. The other configuration is the same as that of the first embodiment, and the operation will be described below by diverting.

FIG. 20 is a diagram for explaining the operation of the individual information multiplexer 1901. The individual information multiplexing device 1901 has a buffer of one or more packets, and checks the type of the packet while sequentially storing the transport stream in the buffer, and sequentially transmits the packet. Further, the buffer holding the second EMM received from the second EMM generation unit 308 also has one or more packets. When the first EMM is detected in the transport stream when the second EMM is held, the second EMM and the first EMM held are exchanged and transmitted. When the second EMM is not held, information unnecessary for the CATV terminal 107 can be deleted by replacing the first EMM with a null packet.

As described above, according to the present embodiment, individual information multiplexer 1901 transmits the second EMM or null packet instead of the first EMM.
The individual information multiplexer 1901 can multiplex the second EMM without changing the transmission rate of the transport stream, and the first EMM that is not necessary for the CATV terminal 107
Since it is possible to delete the MM, the CATV terminal 10
The effect that the malfunction of 7 can be prevented can be obtained.

In this embodiment, the individual information multiplexer 1901 replaces the second EMM with the first EMM. However, the second EMM may be replaced with a null packet or the first ECM. In this way, the second EMM can be used without changing the transmission rate of the transport stream.
Transmission capacity can be increased. Furthermore, in this case,
When the second EMM is not held, the first ECM may be replaced with a null packet.
This leads to prevention of malfunction of the terminal 107.

Further, time information for reproducing video and audio may be recalculated as needed.

(Fifth Embodiment) FIG. 21 shows a CATV station.
3 is an example showing a configuration of a main part of a multiplexing unit 304 in 105.

The multiplexing unit 304 includes a common information multiplexing device 2101 and a multiplexing device 2102. When the common information multiplexing device 2101 receives the transport stream from the PSI conversion unit 303 and receives the second ECM, it Until the second ECM is received, it is repeatedly transmitted to the multiplexer 2102 at regular intervals. The multiplexer 2102 multiplexes the second EMM with the transport stream and transmits the multiplexed EMM. The other configuration is the same as that of the first embodiment, and the operation will be described below by diverting.

FIG. 22 is a block diagram of the common information multiplexing apparatus 2101.
It is a figure which shows the reception timing and transmission timing of a 2nd ECM.

Normally, the broadcast center 101 updates Ks (scramble key) at regular intervals, and changes and sends the first ECM each time. Since the content cannot be viewed unless the direct receiving terminal 104 receives the Ks normally, the first ECM having the same content should be kept in mind during the Ks update interval.
Is sent several times. For example, the first ECM transmission interval is Ks, for example, the Ks update interval is 3 seconds, the first ECM transmission interval is 500 ms, and so on.
It is set shorter than the update interval.

Similarly, for CATV terminal 107, Ks
Since the second ECM needs to be normally received, the second ECM is set to Ks
Must be done several times during the update interval. Therefore, as shown in FIG. 22, Ks is updated from the broadcast center 101, that is, transmitted once every second ECM update, and the second information is transmitted until the common information multiplexing apparatus 2101 receives the next second ECM. ECM
Is resent. In this way, compared to the case where the broadcast center 101 retransmits the second ECM, the transmission capacity of information other than the second ECM on the satellite link 102 can be increased.
The effect is obtained that the ATV terminal 107 can also receive Ks normally.

When retransmitting the second ECM, the cyclic counter of the TS packet header 1401 shown in FIG. 14 is sequentially updated.

As a method of terminating the resending process of the second ECM, there is a method of terminating when the next second ECM is not received within a period longer than the above-mentioned fixed interval. As another method, there is a method in which an identifier indicating the last ECM is provided in the non-encrypted area of the second ECM. As another method, the item indicating the scramble control of the TS packet header 1401 such as the corresponding video or audio is checked, and if it is determined that the scramble is not performed, the transmission of the corresponding second ECM is terminated. There is also a method.

As described above, according to the present embodiment, the broadcast center 101 transmits the second ECM only once each time it is updated, and the common information multiplexing device 2101 of the CATV station 105 transmits the second ECM. Since retransmission processing is performed,
Thus, the effect of increasing the transmission capacity of information other than the second ECM can be obtained.

It is to be noted that the common information multiplexing apparatus 2101 operates as the second EC.
When retransmitting M, the first ECM, the first EMM,
Alternatively, transmission may be performed by replacing the null packet.

FIG. 23 is a diagram showing a main part of the format of the second ECM.

As shown in FIG. 23, the non-encrypted part of the second ECM is provided with a program attribute 2301 indicating whether the viewing judgment performed by the CATV terminal 107 is a tier judgment or a PPV (pay-per-view) judgment. From 101, tier information 2304 and PPV (pay-per-view) information 2305 are included in the viewing determination area.
Is stored, and the program attribute 2301 is transmitted without specifying a particular determination method. Upon receiving the second ECM, the common information multiplexing apparatus 2101 changes the program attribute 2301 to a value indicating one or both of the tier determination and the PPV determination and transmits the program attribute 2301 according to the operation method of the corresponding content.

The CATV terminal 107 checks the program attribute 2301 and compares the contract information tier bit with the tier information 2304 of the second ECM to make a viewing judgment if the tier is judged. , PPV contract information and P
A viewing determination is made by comparing the information with the PV information 2305. Program attribute 23
If 01 indicates both the tier determination and the PPV determination, viewing is possible if it is determined that viewing is possible in any of the viewing determinations.

Thus, the program attribute 2301 is added to the second ECM.
And the broadcast center 101 stores the tier information 230 in the second ECM.
4 and the PPV information 2305 are stored and transmitted, and the common information multiplexing apparatus 2101 changes the program attribute 2301 according to the operation, so that the CATV station 105 can operate independently and flexibly. Can be

Further, a plurality of CATV stations 105 are
When connected to 01, one CATV station 105 can operate a certain content in a tier, and another CATV station 105 can operate the same content in a PPV. As described above, an effect that a flexible operation can be obtained is obtained.

(Sixth Embodiment) FIG. 24 shows the second EC
FIG. 3 is a diagram showing a main part of an M format. Since the system configuration is the same as that of the fifth embodiment, the operation will be described below by diverting.

As shown in FIG. 24, from the broadcast center 101, the Ks2402 and the KwID2401 of the second Kw obtained by encrypting the encryption part are stored in the second ECM and transmitted. CAT
At V station 105, common information multiplexing apparatus 2101 shown in FIG.
A second E is added by adding a viewing judgment area 2403 unique to the TV station 105.
Send CM.

As described above, according to the present embodiment, the common information multiplexing apparatus 2101 transmits the second ECM by adding the CATV station 105's unique viewing determination area 2403 to the second ECM. Can control conditional access more independently.

FIG. 25 is a diagram showing a main part of a format, which is another example, when the common information multiplexing apparatus 2101 transmits the second ECM. Figure 26 is a CATV terminal
FIG. 9 is a diagram illustrating a main part of a format of a second EMM transmitted to 107.

As shown in FIG. 25, the common information multiplexing device 21
01 adds the viewing determination area 2403 to the second ECM, and KwID 2401 and Ks 2402 of the second Kw and the viewing determination area 24
The area including 03 is encrypted using the third Kw, and the KwID 2501 of the third Kw is added to the second ECM and transmitted. By doing so, the confidentiality of the viewing determination area 2403 can be ensured.

At this time, the third Kw is transmitted to the CATV terminal 107.
Must be notified, but the second EM of the CATV station 105 is required.
As shown in FIG. 26 from the M generation unit 308, the third Ew 2605 and the corresponding Kw ID 2604 of the third Kw are added to the second EMM.
Store and send. Since the CATV terminal 107 can thereby know the third Kw, the CATV terminal 107 can decode the second EMM shown in FIG. 25 and can perform conditional access.

In the above manner, the CATV station 105 can control the conditional access more independently, and
The effect that the secrecy of 2403 can be secured is obtained.

(Seventh Embodiment) FIG. 27 shows a CATV station.
FIG. 2 is an example of a diagram showing a main part of an internal configuration of 105.

The CATV station 105, instead of multiplexing the second EMM generated by the second EMM generating unit 2707 into a stream through a multiplexing unit, modulates the second EMM and modulates it with a frequency. And a frequency converter 2708 for converting the frequency. The second EMM is modulated and frequency-converted, and then mixed with the stream by the mixing unit 2709.

In the CATV station 105, the receiving unit 2702 receives the transport stream relayed from the satellite line 102 and transmits the transport stream to the PSI conversion unit 2703. In the PSI conversion unit 2703, as in the first embodiment, the NIT To CATV line 10
6 and send it to the QAM modulator 2704,
The QAM modulator 2704 performs modulation suitable for the CATV line 106 and transmits the modulated signal to the frequency converter 2705. The frequency converter 2705 converts the transport stream including the content into a corresponding frequency band on the CATV line 106, and Send to 2709.

Also, the second Kw management unit 2706 stores the second Kw
Is transmitted to the second EMM generation unit 2707, the second EMM generation unit 2707 generates a second EMM and transmits it to the modulation unit 2710,
Modulation section 2710 performs appropriate modulation and transmits the result to frequency conversion section 2708, which converts the second EMM into a corresponding frequency band on CATV line 106 and transmits the result to mixing section 2709. The mixing unit 2709 performs frequency multiplexing on the frequency-converted transport stream and the second EMM to perform CAT
Send to V-line 106.

Since the rest of the system configuration is the same as that of the first embodiment, the operation will be described below with reference to the drawings.

FIG. 28 is an example of a diagram showing a frequency arrangement in the CATV line 106.

As shown in FIG. 28, a frequency band for transmitting a transport stream including contents and a frequency band for transmitting a second EMM are provided separately.

In CATV station 105, frequency conversion section 2705
Converts the transport stream including the content to the corresponding frequency, and the frequency conversion unit 2708 converts the second EMM
Is converted to a frequency band 2801 different from that of the transport stream including the content and transmitted.

When the CATV terminal 107 receives the second EMM, the second EMM frequency band 28
01 is received, the second EMM addressed to itself is received, and contract information and the like are held. When viewing the content, a transport stream including the content is received, a second ECM corresponding to the content is received, and contract information of the second EMM received earlier is received. The viewing determination may be made in comparison with the above.

As described above, according to the present embodiment, CA
In the TV station 105, the frequency conversion unit 2708
Is transmitted using a frequency band different from the frequency band for the transport stream including the content, so that the CATV station 105 does not care about the transmission capacity of the transport stream including the content,
The effect is obtained that the second EMM can be transmitted at any timing without affecting the content.

FIG. 29 is another example of a diagram showing a main part of the internal configuration of CATV terminal 107 in the present embodiment.

The CATV terminal 107 includes a demodulation unit 2908 for demodulating the second EMM and a frequency band 28 for the second EMM.
A distribution unit 2901 that distributes 01 to the demodulation unit 2908 and a second EMM extraction unit 2909 that extracts a second EMM addressed to itself are provided.

In CATV terminal 107, distribution section 290
1 distributes the second EMM frequency band 2801 from the signal of the CATV line 106 to the demodulation unit 2908, and divides the remaining signal into a tuner.
Send to 2902. The demodulation unit 2908 demodulates the second EMM and transmits the demodulated data to the second EMM extraction unit 2909. When the second EMM extraction unit 2909 receives the second EMM addressed to itself, the demodulation unit 2908 transmits to the conditional access module 2905 Send a second EMM addressed to yourself. The separation unit 2903 receives the transport stream including the content to be viewed via the tuner 2902 and the demodulation unit 2903, and transmits the second ECM to the conditional access module 2905.
Send to When the conditional access module 2905 receives the second EMM, it holds contract information, Kw, and the like,
When the second ECM is received, a viewing determination is made using the held contract information.
Ks included in the CM is transmitted to the descrambler 2906. The descrambler 2906 descrambles the content based on Ks, transmits the descrambled content to the output control unit 2907, and the output control unit 2907 outputs the content.

When CATV terminal 107 is configured as described above, distribution section 2901 distributes the second EMM and demodulation section 2908
To the conditional access module 2905 via the second EMM extraction unit 2909, so that even if the tuner 2902 is receiving the frequency band of the transport stream containing the content, the second EMM
Can be received. In addition, since a demodulation unit 2908 for demodulating the second EMM is provided separately from the demodulation unit 2903, any modulation method can be adopted independently of the modulation method of the transport stream including the content. it can. For example, if the modulation scheme of the transport stream including the content is 64QAM, the modulation scheme of the second EMM can perform modulation independently, such as PSK, QPSK, FSK, and other QAM.

(Eighth Embodiment) FIG. 30 shows a CATV station.
FIG. 2 is an example of a diagram showing a main part of an internal configuration of 105.

The CATV station 105 transmits the second EMM to the CATV terminal through the public network 3004, and includes a communication unit 3003 for transmitting the second EMM.

The second Kw management unit 300 of the CATV station 105
1 transmits the second Kw to the EMM generation unit 3002, the second EMM generation unit 3002 generates the second EMM, and transmits the second EMM to the communication unit 3003. The communication unit 3003 communicates with the CATV line 106. Transmits the second EMM to another transmission path, for example, a public network 3004. The other configuration is the same as that of the seventh embodiment, and will be described by diversion.

FIG. 31 is an example of a diagram showing a main part of the internal configuration of CATV terminal 107.

The CATV terminal 107 has a communication unit 3101, and includes a CATV station 105, a CATV line 106, and a public network 30.
Connected with 04. In the CATV terminal 107, the communication unit 3101 receives the second EMM addressed to itself from the public network 3004 and transmits it to the conditional access module 3105. When the conditional access module 3105 receives the second EMM, the second Kw
When the second ECM is received from the separating unit 3104, a viewing determination is performed by comparing the held E-mail with the held contract information. When it is determined that viewing is possible, the Ks included in the second ECM is determined. Transmit to descrambler 3106.

As described above, according to the present embodiment, C
In the ATV station 105, the communication unit 3003 transmits the second EMM to the public network 3
004, and in the CATV terminal 107, the communication unit 3101 receives the second EMM from the public network 3004, and
Since the transmission is performed to the 3105, the second EMM can be transmitted at an arbitrary timing without affecting the transport stream including the content on the CATV line 106. Further, even when the CATV line 106 has no frequency band for transmitting the second EMM, the transmission of the second EMM is possible.

Although the public network 3004 is used in this embodiment, the present invention is not limited to this, and various transmission means such as a dedicated line or wireless communication can be used.

(Ninth Embodiment) FIG. 32 shows a broadcast center.
1 is an example of a diagram showing a main part of an internal configuration of 101. FIG.

The broadcasting center 101 transmits the second ECM to the CATV station through a dedicated line, and the communication unit 32
04 is equipped.

[0202] The communication unit 3204 includes the second ECM generation unit 32.
02, and a CATV station 10 via a dedicated line 3205.
It can communicate with 5. Second Kw management unit 320
1 transmits the second Kw to the second ECM generator 3202, and the simulcrypt controller 3203 transmits the Ks received from the Ks generator 208 together with the first ECM generator 204 to the second ECM generator 204.
It transmits to generating section 3202. The second ECM generation unit 3202 generates a second ECM based on the received Ks and the second Kw,
The communication unit 3204 transmits the second EMM to the dedicated line 3205. Simulcrypt control unit 3203 transmits the first ECM received from first ECM generating unit 204 to the multiplexing unit, and transmits Ks to scrambler 210.

FIG. 33 shows the multiplexing section 304 in the CATV station 105.
FIG. 2 is an example of a diagram showing a configuration inside and around the device. As shown in FIG. 33, the CATV station 105 has a communication unit 3303,
The communication unit 3303 is connected to the broadcast center 101 via a dedicated line 3205. In the CATV station 105, the communication unit 3303 receives the second ECM transmitted from the dedicated line 3205 and transmits the second ECM to the common information multiplexing device 3301. The common information multiplexing device 3301 multiplexes the received second ECM into a transport stream including the content and transmits the multiplexed device to the multiplexing device 3302. The multiplexing device 3302 further multiplexes and transmits the second EMM. The other elements that are not shown are the same as those of the first embodiment, so that the details are omitted.

The operation of the conditional access system configured as described above will be described below. The broadcast center 101 sends the content, the first ECM and the first EM to the satellite line 102.
A transport stream containing M is transmitted to the communication unit 32.
In step 04, the second ECM is transmitted to the dedicated line 3205.

In the CATV station 105, the communication section 3303 is connected to the dedicated line 3
The second ECM is received from 205, and the common information multiplexing device 3301
Multiplexes and transmits the second ECM to the transport stream received from the satellite line 102.

As described above, according to the present embodiment, since there is no second ECM unnecessary for direct receiving terminal 104 on satellite line 102, it is possible to prevent malfunction of direct receiving terminal 104. Further, the effect that the transmission capacity on the satellite link 102 can be increased is obtained.

FIG. 34 is a diagram for explaining the operation of the common information multiplexing device 3301. As a method for multiplexing the second ECM, as shown in FIG. 34, the first ECM and the second ECM are used.
There is a method of multiplexing by exchanging CMs. The common information multiplexing device 3301 has a buffer of one or more packets, and checks the type of the packet while sequentially storing the transport stream in the buffer, and sequentially transmits the packet. Also,
The buffer holding the second ECM received from the communication unit 3303 also has one or more packets. And the second ECM
When the first ECM is detected in the transport stream, the second ECM and the first ECM are exchanged and transmitted. This makes it possible to multiplex the second ECM without changing the transmission rate of the transport stream.
In this case, the same effect can be obtained by multiplexing the second ECM instead of the first ECM instead of the null packet or the first EMM.

When the second ECM is not held and the first ECM is detected, a null packet may be replaced. In this way, CAT
Since the first ECM unnecessary for the V terminal 107 is not sent to the CATV line 106, the malfunction of the CATV terminal 107 is prevented.

[0209] In this embodiment, the broadcast center
It is necessary to share the second Kw between the second Kw management unit 3201 of the CATV station 105 and the second Kw management unit 307 of the CATV station 105. As the method, a method using a dedicated line 3205 is used. There is. That is, in the broadcast center 101, the second Kw management unit 3201 is connected to the communication unit 3204, and sends out the second Kw to the dedicated line 3205 via the communication unit 3204. Also, CA
In the TV station 105, the second Kw management unit 307 includes a communication unit 3303.
And a second Kw is received from the dedicated line 3205 via the communication unit 3303. Dedicated line 32
If 05 is capable of two-way communication, there is a method of transmitting the second Kw from the CATV station 105 to the broadcast center 101 via the dedicated line 3205. In this case, the broadcast center 101
When a plurality of CATV stations 105 are connected to the network, the second Kw is transmitted from one CATV station 105 to the broadcasting center 101 via the dedicated line 3205, and the broadcasting center 101 is dedicated to the other CATV stations 105. There is also a method of transmitting the second Kw via the line 3205. Also, a dedicated line 3205 from one CATV station 105 to the broadcast center 101 and other CATV stations 105
There is also a method of transmitting the second Kw via the.

[0210] When the second Kw is transmitted over the leased line 3205, the secrecy of the second Kw can be improved by using a secret key cryptosystem or a public key cryptosystem. Become.

[0211] The second method of sharing Kw is as follows.
It is possible to combine any one of the method using the method 05, the storage medium described in the first embodiment, the method using the satellite line 102 and the public network.

(Tenth Embodiment) FIG. 35 is an example of a diagram showing an entire configuration of a conditional access system.

This system includes a first viewing history collection center 3501 for collecting viewing history of the CATV terminal 107, and a second viewing history collection center 3502. The CATV terminal 107 includes a communication unit 350 for performing communication using the public network 3503.
4, the first viewing history collection center 3501 and the second viewing history collection center 3502 are connected via a public network 3503 to C
It is connected to the ATV terminal 107. Other configurations are first
Since the operation is the same as that of the first embodiment, the operation will be described below.

[0214] The CATV station 105 stores the telephone number of the second viewing history collection center 3502 in the second EMM and transmits it.
The ATV terminal 107 holds the telephone number. The broadcast center 101 stores the telephone number of the first viewing history collection center 3501 in the second ECM, if necessary, and transmits the second ECM according to the content. When the CATV terminal 107 views the content operated by the PPV, it is necessary to transmit the viewing history. In the present embodiment, the CATV terminal 107 shown in FIG.
Is transmitted as in the flowchart shown in FIG. That is, Step 3601: the second E corresponding to the viewed content
It is determined whether the CM stores the telephone number of the first viewing history collection center 3501. If there is a telephone number, Step 3602: Call the first viewing history collection center 3501 to transmit the viewing history. Also, in step 3601,
If there is no telephone number, step 3603: A telephone call is made using the telephone number of the second viewing history collection center 3502 previously received by the second EMM, and the viewing history is transmitted.

As described above, according to the present embodiment, the viewing history is transmitted by preferentially using the telephone number stored in the second ECM. The viewing history can be collected at the place.

In the present embodiment, the telephone number of the second viewing history collection center 3502 is stored and transmitted in the second EMM, but the CATV line 106 can perform two-way communication, and the CATV station 105 If you collect viewing history,
This telephone number is not particularly necessary. If the telephone number is not stored, in step 3603 of FIG.
The viewing history may be transmitted using the line 106.

(Eleventh Embodiment) FIG. 37 is an example of a diagram showing the entire configuration of a conditional access system.

The broadcast center 3701 includes one or more first CATV stations 3703 for transmitting the second EMM, and an N-th EMM station.
And one or more first CATV terminals 3705 are connected to the first CATV station 3703 via a CATV line 3704, and the second CATV station 3705 is connected to the first CATV station 3703. One or more second CATV terminals 3708 are connected to the 3706 via a CATV line 3707. The direct receiving terminal 3702 is connected to the broadcasting center 3701 via the satellite line 102.

FIG. 38 is an example of a diagram showing a main part of the internal configuration of broadcast center 3701.

The broadcast center 3701 is different from the broadcast center 101 described with reference to FIG.
And an Nth ECM generation unit 3808, and the Nth Kw
The management unit 3807 sends the Nth Kw to the Nth ECM generation unit 3808, and the simulcrypt control unit 3809 sends Ks to the first EC
M generation unit 3804, second ECM generation unit 3806, and Nth EC
It transmits to the M generation unit 3808. The N-th ECM generation unit 3808 generates the N-th ECM based on the received N-th Kw and Ks, and transmits it to the simulcrypt control unit 3809. First EC
The M generation unit 3804 and the second ECM generation unit 3806 also generate a first ECM and a second ECM, respectively, and transmit them to the simulcrypt control unit 3809, and the simulcrypt control unit 3809 generates the first ECM and the second ECM. Multiplexing section 3811
And sends Ks to the scrambler 3812. The other components correspond to those described in the first embodiment, and a description thereof will not be repeated.

FIG. 39 is a diagram showing a main part of the internal configuration of the second CATV station.

The second CATV station 3706 is an Nth Kw management unit.
3907 and an N-th EMM generation unit 3908, and the other components correspond to the components shown in FIG.

The Nth Kw management unit 3907 stores the Nth Kw in the Nth
To the N-th EMM generation unit 3908
Generates the N-th EMM based on the N-th Kw,
Send to 04. Then, the N-th EMM is multiplexed with the transport stream including the content, and the CATV line 37 is multiplexed.
Send to 07.

The internal configuration of the first CATV station is the same as the configuration described with reference to FIG. 3. A second EMM is generated, and the second EMM is multiplexed on a transport stream including contents, and the second EMM is transmitted to the CATV line 3704. Send out.

The operation of the conditional access system having the above configuration will be described below.

The broadcasting center 3701 stores the contents and the first EC
M, the first EMM, the second ECM, and the Nth ECM to the satellite line 102, and the first CATV station 3703
A second EMM is multiplexed with a transport stream including contents and transmitted to a line 3704, and a second C
It is assumed that the ATV station 3706 multiplexes the Nth EMM with the transport stream including the content to the CATV line 3707 and transmits the transport stream. The first CATV terminal 3705 is the second EC
M and the second EMM are used to make a viewing determination, and a second C
The ATV terminal 3708 makes a viewing determination using the N-th ECM and the N-th EMM. The direct receiving terminal 3702 makes a viewing determination using the first ECM and the first EMM.

As described above, according to the present embodiment, the broadcast center 3701 transmits the second ECM and the N-th ECM in addition to the first ECM, and the first CATV station 3703 transmits the second ECM and the N-th ECM. The second CATV station 3706 transmits the second EMM.
Since M is transmitted, the effect is obtained that each CATV station can independently operate conditional access.

By doing so, a plurality of ECMs
Is transmitted from the broadcast center 3701, and each CATV station can perform conditional access using an ECM suitable for the operation of the own station, and can operate independently more flexibly.

As a method of sharing each Kw, a method using a storage medium, a satellite line 102, a public network, and a dedicated line connecting a broadcasting center 3701 and a CATV station, which has been described in another embodiment, is used. it can. In this case,
For example, when the second Kw is shared, transmission may be performed only to the CATV station using the second Kw. The same applies to other Kw, and only the necessary CATV station is transmitted. You may make it transmit.

[0230] It should be noted that all the figures described in all the embodiments describe only essential parts, and components that are not considered necessary for the present invention are omitted.

It is needless to say that all the embodiments can be used in combination as needed.

It is needless to say that the transport stream to be transmitted in all the embodiments is not one but a plurality.

Further, the satellite line and the CATV line in all the embodiments are not particularly limited.
Various transmission lines such as a CATV line, a satellite line, a dedicated line, a wireless communication, and a public network can be applied.

[0234]

As is apparent from the above description, the conditional access system of the present invention has the following effects.

The CATV station can provide the content from the center device to the CATV terminal device with a simple configuration, reduce the cost, and perform the CATV station's own limited reception.

The center device is an EC for a CATV terminal.
In a system in which M is transmitted to a CATV station via a dedicated line, ECM unnecessary for the direct receiving terminal is removed from the satellite line, thereby preventing malfunction of the direct receiving terminal.

In a system in which a CATV station repeatedly sends out a received ECM for a CATV terminal at regular intervals, it is possible to divert the transmission capacity of a satellite line to the transmission of contents and the like. The effect of further improving the image quality and increasing the number of channels can be obtained.

Further, by encrypting the ECM for the CATV terminal and the ECM for the direct receiving terminal using different encryption methods, conditional reception for the CATV terminal and the direct receiving terminal can be performed independently. Even if the scheme is broken, there is an effect that the other conditional access is not affected.

Further, by making the configuration of the access determination area of the ECM for the CATV terminal different from that of the ECM for the direct receiving terminal, it becomes possible to independently perform conditional reception for the CATV terminal and the direct receiving terminal. Even if the structure of the access determination area is found and tampered with, the effect is obtained that the other conditional reception is not affected.

[0240] Also, the CATV station uses the ECM for the CATV terminal.
, And by encrypting this with a third work key, conditional access to the CATV terminal can be performed more independently, and CA
The effect that secrecy of ECM for TV terminals can be secured is obtained.

Further, the CATV station removes the ECM or EMM for the receiving terminal directly from the received stream, or replaces the ECM or EMM for the CATV terminal with the relay, thereby reducing the transmission capacity of the information transmitted to the CATV line. The effect of being able to increase is obtained.

Further, the CATV station uses a CATV station in a frequency band different from the frequency band for relaying information including contents.
By transmitting the terminal EMM, the effect that the CATV terminal EMM can be transmitted with an arbitrary transmission capacity without affecting the transmission capacity of the information including the content is obtained.

Further, by enabling the CATV station to set a program attribute indicating a tier program or a pay-per-view program, an effect is obtained that conditional access to a CATV terminal can be performed independently.

Further, the system of the present invention has an effect that the work key for the CATV terminal can be easily and reliably shared between the center device and the CATV station.

Further, there is an effect that the CATV station can independently change the work key for the CATV terminal.

[0246] Further, there is an effect that the viewing history of the terminal device can be collected at an arbitrary viewing history collection destination.

[0247] Although the present invention has been described specifically for CATV stations, the present invention can be applied to other relay apparatuses, and in that case, similar effects can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a conditional access system according to a first embodiment of the present invention;

FIG. 2 is an internal configuration diagram of a broadcast center according to the first embodiment of the present invention;

FIG. 3 is an internal configuration diagram of a CATV station according to the first embodiment of the present invention;

FIG. 4 is an internal configuration diagram of a direct receiving terminal according to the first embodiment of the present invention;

FIG. 5 is an internal configuration diagram of a CATV terminal according to the first embodiment of the present invention;

FIG. 6 is a basic configuration diagram of an EMM according to the first embodiment of the present invention,

FIG. 7 is a basic configuration diagram of an ECM according to the first embodiment of the present invention,

FIG. 8 is a diagram showing an operation of the conditional access module according to the first embodiment of the present invention;

FIG. 9 is a configuration diagram of a viewing determination tier bit according to the first embodiment of the present invention;

FIG. 10 is a configuration diagram of a contract information tier bit according to the first embodiment of the present invention;

FIG. 11 is a configuration diagram of a viewing determination bitmap according to the first embodiment of the present invention;

FIG. 12 is a configuration diagram of a contract information bitmap according to the first embodiment of the present invention;

FIG. 13 is an internal configuration diagram of a multiplexing unit according to the second embodiment of the present invention;

FIG. 14 is a diagram showing a main part of a header part of an MPEG2 transport stream packet.

FIG. 15 is a basic configuration diagram of an ECM according to the second embodiment of the present invention;

FIG. 16 is an internal configuration diagram of a multiplexing unit according to a third embodiment of the present invention;

FIG. 17 is a diagram showing a basic configuration of an EMM according to a third embodiment of the present invention;

FIG. 18 is a diagram showing an operation of the multiplexer according to the third embodiment of the present invention;

FIG. 19 is an internal configuration diagram of a multiplexing unit according to a fourth embodiment of the present invention;

FIG. 20 is a diagram illustrating an operation of an individual information multiplexing apparatus according to a fourth embodiment of the present invention;

FIG. 21 is an internal configuration diagram of a multiplexing unit according to a fifth embodiment of the present invention;

FIG. 22 is a diagram showing an operation of the common information multiplexing apparatus according to the fifth embodiment of the present invention;

FIG. 23 shows a second E in the fifth embodiment of the present invention.
CM configuration diagram,

FIG. 24 shows a second E according to the sixth embodiment of the present invention.
CM configuration diagram,

FIG. 25 shows a second E in the sixth embodiment of the present invention.
CM configuration diagram,

FIG. 26 shows a second E according to the sixth embodiment of the present invention.
MM configuration diagram,

FIG. 27 shows a CATV according to the seventh embodiment of the present invention.
Station internal configuration diagram,

FIG. 28 shows a CATV according to the seventh embodiment of the present invention.
Diagram showing frequency bands on the line,

FIG. 29 shows a CATV according to the seventh embodiment of the present invention.
Terminal internal configuration diagram,

FIG. 30 shows a CATV according to the eighth embodiment of the present invention.
Station internal configuration diagram,

FIG. 31 shows a CATV according to an eighth embodiment of the present invention.
Terminal internal configuration diagram,

FIG. 32 is an internal configuration diagram of a broadcast center according to a ninth embodiment of the present invention;

FIG. 33 shows a CATV according to a ninth embodiment of the present invention.
Block diagram of the inside and around the multiplexing section of the station,

FIG. 34 is a diagram illustrating an operation of the common information multiplexing apparatus according to the ninth embodiment of the present invention;

FIG. 35 is an overall configuration diagram of a conditional access system according to a tenth embodiment of the present invention;

FIG. 36 shows a CAT according to the tenth embodiment of the present invention.
Diagram showing the operation of the V terminal,

FIG. 37 is an overall configuration diagram of a conditional access system according to an eleventh embodiment of the present invention;

FIG. 38 is an internal configuration diagram of a broadcast center according to an eleventh embodiment of the present invention;

FIG. 39 is an internal configuration diagram of a second CATV station according to an eleventh embodiment of the present invention;

FIG. 40 illustrates a conventional pass-through method.

FIG. 41 is a diagram illustrating a conventional simulcrypt method.

[Explanation of symbols]

 101, 3701 Broadcasting center 104, 3702 Direct receiving terminal 105 CATV station 107 CATV terminal 202, 3803 First EMM generator 204, 3804 First ECM generator 205, 3202, 3806 Second ECM generator 206, 3201, 3805 Second Kw management unit 207, 3203, 3809 Simulcrypt control unit 303, 2703, 3903 PSI conversion unit 304, 3904 Multiplex unit 305, 2704, 3905 QAM modulation unit 306, 2705, 3906 Frequency conversion unit 307, 2706, 3001 Second Kw management unit 308, 2707, 3002 Second EMM generation unit 404, 504, 2904, 3104 Separation unit 405, 505, 2905, 3105 Conditional reception module 1301 Common information removing device 1302, 1602, 2102, 3302 Multiplexing device 1501 ECM identifier 1601 Individual information remover 1701 EMM identifier 1901 Individual information multiplexing device 2101, 3301 Common information multiplexing device 2301 Program attributes 2710 Modulator 2708 Frequency converter 2901 Distributor 2909 Second EMM extractor 3003 Communication unit 3101 Communication unit 3204 Communication section 3303 Section 3501 first viewing history collection center 3502 second viewing history collection center 3703 first CATV station 3705 first CATV terminal 3706 second CATV station 3708 second CATV terminal 3907 Nth Kw management section 3908 N EMM generator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsunori Sakurai 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Yoshimasa Goto 1006 Kadoma, Kazuma, Osaka Pref.F-term in Matsushita Electric Industrial Co., Ltd.

Claims (32)

[Claims] A center device, one or more relay devices, and one or more relay devices.
One or more first terminal devices are connected by a first transmission line,
A conditional access system in which the relay device and one or more second terminal devices are connected via a second transmission path, wherein the center device scrambles a content including any of video, audio, data, and the like. The first common information including a scramble key for scrambling the content and a first access determination area for determining access to the content is transmitted to the first transmission path and encrypted and multiplexed with the content. A first work key for encrypting the first common information and a first individual information including contract information of the first terminal device are encrypted and multiplexed on the content, and the scramble key and the content are encrypted. The second common information including the second access determination area for performing access determination to the encrypted with the second work key and multiplexed with the content, The relay device relays the information including the content received from the first transmission line to the second transmission line, and includes the second work key and contract information of the second terminal device. The second individual information is encrypted, multiplexed with information including the content, and transmitted to the second transmission path. The first terminal device includes a first access determination area included in the first common information. And the contract information included in the first individual information, and the second terminal device includes a second access determination area and the second individual information included in the second common information. A conditional access system, wherein access control to the content is performed based on contract information included. 2. A center device, one or more relay devices, and one or more relay devices.
One or more first terminal devices are connected by a first transmission line,
The conditional access system, wherein the relay device and one or more second terminal devices are connected via a second transmission line, and the center device and the relay device are further connected via a third transmission line, The center device scrambles a content including any of video, audio, data, and the like, sends the scrambled content to the first transmission path, and performs a scramble key for scrambling the content and a first to determine access to the content. A first common information including an access determination area is encrypted and multiplexed with the content, and a first work key for encrypting the first common information and a first work key including contract information of the first terminal device are included. While encrypting the individual information and multiplexing it with the content and sending it to the first transmission path, the second determining the access to the scramble key and the content The second common information including the access determination area is encrypted with a second work key and transmitted to the third transmission path, and the relay device transmits the information including the content received from the first transmission path. While relaying to the second transmission path, multiplexing the second common information received from the third transmission path into information including the content, the second work key and the second terminal device The second individual information including the contract information is encrypted and multiplexed with the information including the content and transmitted to the second transmission path, and the first terminal device is included in the first common information. Based on the first access determination area and the contract information included in the first individual information, and the second terminal device, the second access determination area included in the second common information and the Based on the contract information included in the second individual information A conditional access system for controlling access to the content. 3. The center device sends out the second common information once every time it is changed, and when the relay device receives the second common information, the relay device sends the second changed common information next. 3. The method according to claim 1, wherein the second common information is repeatedly transmitted at regular intervals until information is received.
3. The conditional access system according to 1. 4. The center device according to claim 1, wherein the center device encrypts the second common information using an encryption method different from the encryption method for the first common information. The conditional access system described in Crab. 5. The relay device according to claim 1, wherein the relay device encrypts the second individual information using an encryption method different from the encryption method of the first individual information performed by the center device. The conditional access system according to any one of 1 to 4. 6. The method according to claim 1, wherein the first access determination area of the first common information is described by a tier, and the second access determination area of the second common information is described by a channel bitmap. Item 6. A conditional access system according to any one of Items 1 to 5. 7. The method according to claim 1, wherein the first access determination area of the first common information is described by a channel bitmap, and the second access determination area of the second common information is described by a tier. Item 6. A conditional access system according to any one of Items 1 to 5. 8. The center device stores the scramble key in the second common information and sends it out, and the relay device receives the second common information and sends it with an access determination area added. The conditional access system according to any one of claims 1 to 7, wherein: 9. The center device stores the scramble key in the second common information, encrypts the scramble key with the second work key, and transmits the encrypted work key. The relay device receives the second common information. Adding an access determination area, encrypting the area including the received second common information and the added access determination area with a third work key and sending out the same,
The conditional access system according to any one of claims 1 to 7, wherein the second work key and the third work key are stored and transmitted in the second individual information. 10. The relay device according to claim 1, wherein the relay device removes and relays the first common information present in information including the content received from the first transmission path. The conditional access system described in Crab. 11. The relay device, wherein the first common information present in the information including the content received from the first transmission path and the second common information received from the third transmission path The conditional access system according to any one of claims 2 to 9, wherein the relay is performed by replacing the following. 12. The center device appropriately multiplexes the content with empty information and transmits the multiplexed information to the first transmission line, and the relay device transmits information including the content received from the first transmission line. And relaying by removing the first individual information, and multiplexing by replacing the empty information and the second individual information present in the information including the content. The conditional access system according to any one of the above. 13. The relay device according to claim 1, wherein the first individual information present in the information including the content received from the first transmission path is multiplexed by replacing the first individual information with the second individual information. The conditional access system according to any one of claims 1 to 11, wherein 14. The relay apparatus according to claim 1, wherein the relay device frequency-multiplexes the second individual information into a frequency band different from a frequency band in which the information including the content is relayed, and transmits the second individual information. 12. The conditional access system according to any one of the eleventh to eleventh aspects. 15. The relay device and the second terminal device are also connected to a fourth transmission line different from the second transmission line, and the relay device transmits information including the content to the fourth transmission line. Relay to a second transmission path, send out the second individual information to the fourth transmission path, the second terminal device, the second common information received from the second transmission path, The conditional access system according to any one of claims 1 to 11, wherein access control to the content is performed based on the second individual information received from the fourth transmission path. 16. The second common information is provided with a program attribute indicating whether the content is a tier program or a pay-per-view program, and the center device stores tier information in a second access determination area in the second common information. And store and transmit pay-per-view information, and the relay device changes the program attribute of the second common information to a value indicating either a tier program or a pay-per-view program, or both, depending on operation, 16. The limitation according to any one of claims 1 to 15, wherein the second terminal device determines access control in one of tiers and pay-per-views, or both, with reference to the program attribute. Receiving system. 17. The conditional access system according to claim 1, wherein the second work key is transmitted from the center device to the relay device via a storage medium. 18. The conditional access system according to claim 1, wherein the second work key is transmitted from the center device to the relay device via a first transmission path. 19. The conditional access system according to claim 1, wherein the second work key is transmitted from the center device to the relay device via a third transmission path. 20. The conditional access system according to claim 1, wherein the second work key is transmitted from the center device to the relay device using a public network. 21. Sending the second work key from one of the relay devices to the center device by a storage medium, and the center device sends the received second work key to the other relay devices. 21. The method according to claim 16, wherein:
The conditional access system according to any one of the above. 22. The first transmission path is capable of two-way communication, and transmits the second work key from a certain one of the relay devices to the center device through the first transmission line. 21. The conditional access system according to claim 16, wherein the center device sends the received second work key to the other relay devices. 23. The third transmission line is capable of two-way communication, and transmits the second work key from one relay device to the center device via the third transmission line. 21. The conditional access system according to claim 16, wherein the center device sends the received second work key to the other relay devices. 24. transmitting the second work key from one of the relay devices to the center device using a public network;
21. The conditional access system according to claim 16, wherein the center device sends the received second work key to another relay device. 25. The method according to claim 17, wherein the center device or the relay device encrypts the second work key using a secret key cryptosystem and transmits the encrypted second work key. The conditional access system described. 26. The method according to claim 17, wherein the center device or the relay device encrypts the second work key using a public key cryptosystem and transmits the encrypted second work key. The conditional access system described. 27. The center device stores a telephone number of a first viewing history collection destination in the second common information as necessary, and transmits the same, and the relay device transmits the second viewing information as necessary. Storing and sending out the telephone number of the second viewing history collection destination in the individual information, and transmitting the viewing history by preferentially using the first viewing history collection destination telephone number. The conditional access system according to any one of claims 1 to 22, wherein: 28. The common information removing device belonging to the conditional access system according to claim 1 or 2, wherein the common information removing device is installed in the relay device and uses the information including the content to generate the first common information. A common information removing device for removing information. 29. A common information multiplexing apparatus belonging to the conditional access system according to claim 2, wherein the common information multiplexing apparatus is installed in the relay apparatus and includes the content received from the first transmission path. A common information multiplexing apparatus, wherein the first common information of information is replaced with the second common information received from the third transmission path. 30. The individual information removing device belonging to the conditional access system according to claim 1 or 2, wherein the individual information removing device is installed in the relay device, and is configured to determine the first individual information from information including the content. An individual information removing device for removing information. 31. The individual information multiplexing device belonging to the conditional access system according to claim 1 or 2, wherein the individual information multiplexing device is installed in the relay device and the first individual information multiplexing device in the information including the content. An individual information multiplexing apparatus, wherein information and the second individual information are exchanged. 32. A common information multiplexing device belonging to the conditional access system according to claim 3, wherein said common information multiplexing device is installed in said relay device and changes said received second common information next. A common information multiplexing device for repeatedly transmitting the received second common information until the second common information is received.